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Question
Write working of NICAD storage cell. Also write its applications.
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Solution
Working of NICAD:
NICAD is a rechargeable secondary dry cell. It consists of a cadmium anode. The cathode is nickel(IV) oxide, NiO2 supported on Ni. The electrolyte solution is basic (KOH).
The electrode reactions taking place are:
| \[\ce{Cd_{(s)} + 2OH^-_{ (aq)} -> Cd(OH)_{2(s)} + 2e-}\] | (Oxidation at anode) |
| \[\ce{NiO_{2(s)} + 2H2O_{(l)} + 2e- -> Ni(OH)_{2(s)} + 2OH^-_{ (aq)}}\] | (Reduction at cathode) |
| Overall cell reaction: \[\ce{Cd_{(s)} + NiO_{2(s)} + 2H2O_{(l)} -> Cd(OH)_{2(s)} + Ni(OH)_{2(s)}}\] |
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The cell can be recharged as the reaction products are solids that adhere to the electrode surface. It produces a potential of about 1.4 V. The cell has longer life than other dry cells.
Applications of NICAD:
The NICAD cell is used in electronic watches, calculators, photographic equipment.
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